@EA-2170-11 changes in a nutshell (and its better to read yourself in case I miss something):

1) Dictates specifically how far, from the bottom of the hole, the sensor can "live". .625 +- .125
2) Dictates that sensor sleeves must line hole completely from top to bottom.
3) Sleeve must have ribs/fins at bottom of sleeve and at the .625 of the sleeve. This is to isolate the sleeve from the concrete. Must also have an isolation gasket inside the sleeve at the .625 from bottom depth to isolate the sensor from the sleeve. Bottomline, they are trying to do what they can to isolate that very small space of air at .625" from bottom of hole. SOUND FAMILIAR?
4) Sensor must only obtain readings from the bottom of the sleeve. No knockouts and reading from the side.

You should get the standard, there are pictures that do better at explaining.

@JD-"post the ASTM for review"-NICE!! If I had your money I would burn mine. An ATV with power steering--Must be nice!